Could you please help

prove the expansion. cos x = 1 - x^2/2! + x^4/4! - x^6/6! ..... + (-1)^n x^2n/(2n)! + .....

Thank You

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- February 28th 2007, 10:33 AMgrabick_lucaMaclaurin Expansions
Could you please help

prove the expansion. cos x = 1 - x^2/2! + x^4/4! - x^6/6! ..... + (-1)^n x^2n/(2n)! + .....

Thank You - March 1st 2007, 04:30 AMCaptainBlack
- March 1st 2007, 06:04 AMSoroban
Hello, grabick_luca!

Quote:

Prove the expansion:

. . cos x .= .1 - (x^2)/2! + (x^4)/4! - (x^6)/6! + ... + (-1)^n (x^{2n})/(2n)! + .....

Are you supposed to__derive__the expansion by the Maclaurin procedure?

If you know the procedure, what's stopping you?